transformation innaccuracies

I noticed the transformations applied to objects is quite inaccurate:
<rect width="200.000000" height="200.000000" x="100.000000" y="100.000000" style="font-size:12;fill:#808080;fill-rule:evenodd;stroke-width:1pt;" id="rect562" />
Opening the transformations dialog and applying 10 horizontal gives this:
<rect width="200.000000" height="200.000000" x="112.500000" y="99.9999695" style="font-size:12;fill:#808080;fill-rule:evenodd;stroke-width:1pt;" id="rect562" />
Also, If I take that original square and rotate it 10, I get this:
<rect width="200.000000" height="200.000000" x="62.2319183" y="131.691177"
transform="matrix(0.984808,-0.173648,0.173648,0.984808,0.000000,0.000000)" style="font-size:12;fill:#808080;fill-rule:evenodd;stroke-width:1pt;" id="rect562" />
Why have my x and y changed? Shouldn't the matrix handle all aspects of the transformation and leave x and y as they were?
Rob. http://members.rogers.com/rcrosbie
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Robert Crosbie